Determination of tin(II) in pharmaceuticals by amperometric oxidation after complexation with tropolone

Boutakhrit K., Quarin G., ÖZKAN S. A., Kauffmann J.

ELECTROANALYSIS, vol.8, no.8-9, pp.789-794, 1996 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 8-9
  • Publication Date: 1996
  • Doi Number: 10.1002/elan.1140080816
  • Journal Name: ELECTROANALYSIS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.789-794
  • Keywords: tin (II), tropolone, FIA, ATOMIC-ABSORPTION SPECTROMETRY, DIFFERENTIAL-PULSE POLAROGRAPHY, SOLID-PHASE SPECTROPHOTOMETRY, GAS-CHROMATOGRAPHY, STRIPPING VOLTAMMETRY, BUTYLTIN COMPOUNDS, NATURAL-WATERS, TRACE AMOUNTS, TIN-COMPOUNDS, FRUIT JUICES
  • Ankara University Affiliated: Yes

Abstract

Inorganic tin(II) was determined, rapidly and selectively in the presence of tin(IV), by electrooxidation after complexation with tropolone (2-hydroxy-2,4,6-cycloheptatrienone), By cyclic voltammetry, the tin(II)-tropolone complex showed a well-defined irreversible oxidation peak which occurred at -0.014 V (vs. Ag/AgCl) at the glassy carbon electrode in 0.05 molL(-1) acetate buffer pH 5.5. The determination of Sn-II has been realized using FIA and by poising the electrode at +0.1 V. A linear relationship was obtained between peak current and tin(II) in the concentration range 0.25-20 mu molL(-1). The detection limit was 0.1 mu molL(-1) and the RSD calculated by injection of a 5 mu molL(-1) tin(II) solution was 1.5% (n = 10). The optimization of several experimental parameters has been realized and the influence of many cations and possible interfering species encountered in radiopharmaceuticals and in dental gels has been investigated. The method was applied to the determination of tin(II) in dental gels.